Find the value of x that makes the triangles similar
HELPP !!

Answer:
X=-2.25
Step-by-step explanation:
8+10+3(x-1)=7.5+x-1+4
18+3x-3=10.5+x
15+3x=10.5+x
3x-x=10.5-15
2x=-4.5
x=-2.25